/*-
 * <<
 * task
 * ==
 * Copyright (C) 2019 sia
 * ==
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * >>
 */

package com.sia.config.web.util;

import com.sia.core.dag.DAGHelper;
import com.sia.core.entity.JobMTask;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Task loop checking under Job
 *
 * @see
 * @author maozhengwei
 * @date 2019-04-28 15:40
 * @version V1.0.0
 */
public class OnlineJobDagCheck {

  /**
   * Task loop checking under Job
   *
   * @param jobMTaskList
   * @return
   */
  public static List<String> doDagCheck(List<JobMTask> jobMTaskList) {
    Map<String, List<String>> relyMap = new HashMap<>();
    for (JobMTask jobMTask : jobMTaskList) {
      List<String> preTask = Arrays.asList(jobMTask.getPreTaskKey().split(","));
      relyMap.put(
          jobMTask.getTaskKey(),
          (preTask == null || preTask.contains("")) ? Collections.emptyList() : preTask);
    }
    return DAGHelper.findACycle(relyMap);
  }
}
